Aqueous leather coating composition

Patent metadata

Field	Value
Publication number	US-11518905-B2
Application number	US-202017639378-A
Country	US
Kind code	B2
Filing date	Oct 22, 2020
Priority date	Nov 19, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

An aqueous coating composition comprising an aqueous dispersion of polyurethane and a siloxane-based polyamide.

First claim

The invention claimed is:

1. An aqueous coating composition comprising: from 20 to 60 wt % of an aqueous dispersion of polyurethane, and from 0.5 to 10 wt % of a siloxane-based polyamide comprising a block copolymer comprising siloxane and amide blocks.

2. The aqueous coating composition of claim 1 , wherein the siloxane-based polyamide has the following physical properties:
i) weight average molecular weight (Mw) of: 50,000 to 200,000 Daltons;
ii) melting point range of 70 to 120° C.;
iii) melt viscosity of 5000 to 10,000 cps at 140° C.; and
iv) particle size of 0.1 to 15 micron.

3. The aqueous coating composition of claim 1 , wherein the siloxane amide block copolymer is represented by Formula A:

wherein:
(1) DP is 1-700; (2) n is a 1-500; (3) X is a divalent, aliphatic hydrocarbon group having 1-30 carbons; (4) Y is:
(a) a divalent hydrocarbon group having 1-40 carbons, wherein the hydrocarbon group may optionally and additionally be substituted by at least one member selected from the group consisting of (i) hydroxy; (ii) a C3-C8 cycloalkyl; (iii) 1-3 members selected independently from the group consisting of C1-C3 alkyls and phenyl optionally substituted by 1-3 members selected independently from the group consisting of C1-C3 alkyls; (iv) a C1-C3 hydroxy alkyl; and (v) a C1-C6 alkyl amino, and the hydrocarbon group may optionally and additionally contain at least one of (i) 1-3 amide linkages; (ii) a C5 or C6 cyclic, divalent, saturated hydrocarbon group; and (iii) a phenylene optionally substituted by 1-3 members selected independently from the group consisting of C1-C3 alkyls, or
(b) R 20 T(R 21 )R 22 , where R 20 and R 22 are divalent C1-C10 hydrocarbon groups and R 21 is a monovalent or divalent C1-C10 hydrocarbon group, such groups being independent of one another, and T is C(R), where is selected from hydrogen, R′, R 2 , R 3 , R 4 , or a trivalent N, P or Al; and
(5) Each of R 1 , R 2 , R 3 and R 4 is independently selected from the group consisting of methyl, ethyl, propyl, isopropyl, a siloxane chain, and phenyl, wherein the phenyl may optionally be substituted at 1-3 positions by substituents independently selected from the group consisting of methyl and ethyl.

4. The aqueous coating composition of claim 3 wherein DP is 50 to 200 and n is 2 to 50.

5. The aqueous coating composition of claim 3 where R 1 , R 2 , R 3 and R 4 are all methyl; and X and Y are independently selected from a C4-C18 aliphatic hydrocarbon group.

6. The aqueous coating composition of claim 1 wherein the polyurethane has a Mw of: 150,000 to 1,500,000 Daltons.

Assignees

• Dow Silicones Corp
• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Lenoble Bertrand
• Delys Nancy
• Ugazio Stephane
• Nungesser Edwin
• Zhang Xiangyi
• Malotky David

Classifications

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• C09D175/04 Primary

  Polyurethanes · CPC title

• C14C11/006

  using polymeric products of isocyanates (or isothiocyanates) with compounds having active hydrogen · CPC title

• C08G77/455 Primary

  containing polyamide, polyesteramide or polyimide sequences · CPC title